Alternating-current magnet



March 6, 1928. 1,661,345

(2. H. RIPPL ALTERNATING CURRENT MAGNET Filed Feb. 26, 192.7

1 N VEN TOR.

(Eerie: ff.

ATTORNEYS.

45 I magnet which is close Patented Mar. 6, 1928.

UNITED STATES PATENT OFFICE.

CHARLES H. RIPPL, OF EAST CLEVELAND, OHIO, ASSIGNOR TO 'ZIIIHIECIZABK CON- TROLLER COMPANY, OF CLEVELAND, OHIO, A

conronn'rron or 01110.

ALTERNA'IIN G-CURREN '1 ,IAGNET.

Application flied February 26, 1927; Serial No. 171,192.

The present invention relates to the construction of alternating current magnets such as are employed in cont actors, circuit breakers and the like, and has for its object the provision of a magnet which is quiet in operation. In the present construction a U- shaped core is employed, the armature being pivotally mounted on one end of the core and so arranged that the pull on the pivot of the armature is at a right angle to the pull on the other ,or free end of the armature. Another feature of im ortance is the use of an eccentric bushing En the pivotal armature mounting, thus allowing the meeting faces of the armature and pole to be adjusted to obtain quiet action. To the accomplish ment of the foregoing and related ends, said invention, then consists of the means hereinafter fully described and particularly pointed out in theclaims. 4 i

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, hut one of various mechanical forms in which the principle of the invention may he used.

in said annexed drawing:

Fig. l is a side elevational view partly in section showing my improved construction; Fig. Ellis an end elevational View; and Fig. 3 is a perspective view of a detail.

, The present magnet is shown as mounted on a panel l by means of cap screws Q which pass through the panel and engage in threaded apertures 3 in the angle plates 4 in which themagnet is mounted by means of pins 5 which pass through the core laminations and the plates and which are secured in osition by means of cotter pins 6.

he magnet core 10 is. U-shaped' and is made up of laminated sheets as in the usual C. magnet construction and the legs 11 and 1% of the U are horizontal with the bottom of the U in the vertical position against the panel, thus leavindg/ Zn open front to the y a pivotally mounted laminated armature 14. Mounted on the upper leg 11 of the core is the magnet windinglo as well as a shading coil 16 which is formed by a yoked strap member 17 and a rod 18 -mounted in a slot in the end ac'aatee ofthe le 11. This strap member 17 a forwar y 'egztending tongue 19 termiinla downlturned. end'20 which is with an aperture passing over a bolt 21 and held in The lower leg of the core is formed with a substantially cylindrical end 25 which is apertured to receive a bushing 26, the ends of which are turned over to clamp'the laminated core pieces together. Mounted in this bushing is a pivot pin 27. The armature 14 is formed of a series of thin lates or laminations 28 which are secured between two arms 29 which are of less Width than the plates thus allowing the plates to extend slightly beyond the arms to form the meeting face 30 for engagement with the end pole face 31 of leg 11. The plates 28 are curved at their lower ends to fit around the curved end of the lower leg 12 of the core. The lower ends 32 of the armature arms are split as at 33 and are provided with cap screws 34:. These lower ends are apertured to receive eccentric bushings 35 which are held in adjusted position by tightening the cap screws 34. This adjustable bushing allows the armature to be adjusted suilieiently to bring the meeting face 30 thereof into perfect alignment with the face of the upper leg. The open osition of the armature is shown in dotted ines in Fig. 1 and the downwardly extending end 20 of the strap member 1? acts as a stop for the armature as shown, the meeting face of the arma- I ture being beveled ed to rest against the strap end.

n; the present construction only two meetend 31 of the pole. The curved surface 25 on the core and armature ends 28 are spaced apart so as to form a curved gap 41 to prevent sticking.

v The final adjustment of the eccentric bushings 35 is made while the magnet is in operation and the armature position is changed to obtain the quietest possible operation of the unit. The pull of the upper pole face 31 is in a horizontal direction when the magnet is mounted as shown while the pull through the bottom leg 12 against the arma-f ture is downwardl in a vertical direction, that is, thepulls o the two legs of the core on the armature are always at right angles to each other, thus reducing the tendency of the armature to rattle to a minimum.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, providedthe means stated by any of the following claims or the equivalent of such stated means be employed. a

I therefore particularly point out and distinctly claim as my invention:

1. In A. C. magnet construction the combination of a U-shaped core provided with the magnet winding and having a curved end-on one leg, and a faced end on the other leg, an armature having a curved end pivotally mounted about said'first named leg to provide a curved air gap, said armature having a faced portion adapted to be drawn against said other leg, the pull through said faced surfaces of said core leg and armature being substantially at right angles to the pull between said armature and other leg at the pivotal connection and adjusting means at such pivotal connection to allow said two abutting faces to be brought into alignment.

2. In A. C. magnet construction the combination of a U-shaped core provided with the magnet Winding and having a curved end on one leg, and a faced end on the other leg, an armature having a. curved end pivotally mounted about said first named leg to provide a curved air gap, said armature having a faced portion adapted to be drawn against said other leg, said armature having two arms forming a yoke around said curved leg end, a pivot pin mounted in said leg, and

adjustable eccentric; bushings mounted in said two arms and-adapted to receive the ends of said pin to provide an adjustable mounting for said armature 3. In A. C. magnet construction the combination of a U-shaped core having the magnet winding on one leg and having the end eena to bring said faced portion of said armature imp correct alignment'with said faced leg en 4:- In A. C. magnet construction the combination of a U-shaped laminated core having a. pivotal mounting at the end of one leg and a faced end on the other leg, and provided with a magnet Winding, a laminated armature pivotall mounted on said first-named leg and havlng a faced portion adapted to. abut against said faced portion of the other leg to obtain a magnetic pull at right angles to said abutting faces, the pivotal mounting on said armature and said first-named leg being such as to obtain a magnetic pull longitudinally of said armature and at a right angle to the pull through said abutting faces.

5. In A. C. "inagnet construction the combination of a U-shaped laminated core provided with a magnet winding having a curved end on one leg, and a faced end on the other leg, a laminated armature having a curved end pivotally mounted about said first-named leg to provide a curved air gap,

. and to obtain a magnetic pull longitudinally of said armature, said armature having a 

